Illinois State Water Survey - University of Illinois at Urbana-Champaign

Current Climate Events in Illinois

You can find the significant climate events of this year, as well as 2010 and 2011, on my blog at http://climateillinois.wordpress.com/

New Climate Normals for Illinois

You can find the new 1981-2010 climate normals for Illinois through the station list or a Google Map interface. We just added a new climate normals map page on October 26, 2011.

Climate Division Data for Illinois

You can find monthly data for temperature, precipitation, and other parameters by climate division for Illinois here.

New 2011 Drought Page

You can find important information on the 2011 drought in Illinois, including monthly precipitation data and normals for over 200 sites in Illinois at the 2011 Drought in Illinois.

Comparison of ISWS Bulletin 70 and NOAA Atlas 14

We have completed an initial comparison between ISWS Bulletin 70 and NOAA Atlas 14 in Illinois for the 24-hour, 1 percent (100-year) storm. For most of Illinois, Bulletin 70 still yields higher rainfall totals than Atlas 14. The complete analysis can be found here.

New Blog

I have launched a new blog at http://climateillinois.wordpress.com/ to post news items and report on events as they happen. The Illinois State Climatologist Office website will remain as the "home base" for climate information related to Illinois.

Climate Events of 2009 in Illinois

Find the significant climate-related events of 2009 in Illinois here.

• 2009, 4th Wettest Year on Record
• Cold, Wet December Finishes Out Cold, Wet Year
• First Major Winter Storm of the Season Hits Midwest
• Seventh Warmest November on Record
• Second Wettest October on Record
• Cool, Wet Growing Season Delays Harvest
• September Brings Uneven Rainfall across State
• Impacts of El Niño on Temperature and Precipitation
• Tracking the first fall freeze across the Midwest
• Illinois Agricultural Disaster Declaration
• Cool, wet summer
• New average wind speed maps
• Coldest July on record
• June - another wet month
• Hot, humid weather arrives
• Fifth Wettest Sprint on Record
• Sixth Wettest April on Record
• March - Wet in the North, Dry in the South
• Where is Spring
• Average Last Spring Frost
• February - More Rain, Less Snow
• Illinois Temperature Roller Coaster
• Former Champaign-Urbana weather observer passes away
• Cold January
• Arctic Air Grips Illinois

Climate Events in Illinois Archive

• 2008 Events
• 2007 Events
• 2006 Events
• 2005 Events
• 2004 Events
• 2003 Events
• 2002 Events